PORTSMOUTH — With his 17-month bid to win the presidency reaching its zenith, Republican Mitt Romney will make his second-to-last pitch to New Hampshire voters Saturday at Pease International Tradeport.

Romney will travel by motorcade in the morning to Portsmouth International Airport, located on the border of Newington and Portsmouth, where his campaign will host an outdoor rally.

Airport manager Bill Hopper said an estimated 2,000 people could be in attendance for the event, which falls three days before the Nov. 6 election.

Pease has been the backdrop for campaign events in each of the last three presidential races. Republican George W. Bush held his first rally at the airport 12 years ago, meeting with voters inside a Pan Am airplane hangar after arriving in a TWA jet. He campaigned in the same spot in 2004, arriving that time on Air Force One.

President Barack Obama has also campaigned at Pease in the heat of a tight election race. He rallied voters at the Pan Am hangar days before the 2008 New Hampshire primary.

Hopper said the Romney campaign is tentatively planning to host Saturday's event outdoors, in front of Romney's campaign jet. He'll depart from the airport directly after exiting the stage, Hopper said.

Members of the public will be admitted to the event beginning at 6:30 a.m., and the program will begin at about 9 a.m., according to the campaign.

Tickets will be available at the Romney campaign's Dover Victory Center, located at 104 Washington St. in Dover, or the Stratham Victory Office at 72 Portsmouth Ave., Unit 101 in Stratham. Tickets are also available online at www.mittromney.com/NH.

Parking will be available in the airport terminal's 1,100-car parking lot.

Obama will make what is likely to be his final campaign stop in the Granite State on Sunday. He is slated to hold a campaign event in downtown Concord, accompanied by former President Bill Clinton.

The event takes place in Concord at the corner of School and Main streets.

Doors for the event will open at 7 a.m. The campaign is advising those who plan to attend to take note of the fact Daylight-saving time will end early Sunday morning, moving clocks backward one hour overnight.

Free parking will be available in downtown Concord and shuttles will be available at 7 Hazen Drive starting at 6 a.m., according to a campaign announcement.

Tickets are available on a first-come, first-served basis online at: www.obamanh.com. Tickets are also available to pick up today and Saturday from 8 a.m. to 8 p.m. at the New Hampshire Democratic Party Office at 105 North State St. in Concord, or at the Obama for America field office in Manchester on the third floor of 228 Maple St.

Romney will return to New Hampshire on the eve of Election Day, winding down his campaign a few dozen miles from the spot where he announced his candidacy last June.

The former Massachusetts governor will travel to Manchester on Monday night for an event at the Verizon Wireless Arena, where he'll be joined by singer Kid Rock.

Also making stops in New Hampshire during the lead-up to Election Day are a host of political surrogates, including Caroline Kennedy and Democratic Party Chairwoman Debbie Wasserman Schultz.

Schultz will kick off a so-called “Granite State Women Decide 2012 Tour” on Friday, with scheduled appearances in Claremont, Littleton, Berlin and Conway.

Kennedy will also discuss issues of importance to women in the presidential race when she campaigns in the state Saturday. She will appear in Portsmouth, Rochester, Derry, Manchester, Lebanon, and Concord, according to the campaign.

Republican Sens. Kelly Ayotte, of New Hampshire, and Marco Rubio, of Florida, were on hand in Manchester Thursday to campaign for Romney.

Both campaigns are also relying on hundreds of volunteers to make calls and knock on doors to talk to potential voters. New Hampshire is the smallest of the major battleground states, but the campaigns are acutely aware of its potential to alter the outcome of the election if the national contest is tight.

Obama won New Hampshire in 2008, and recent polls have given him an edge over Romney in the state where Romney owns a summer home and has maintained a significant campaign presence since the January presidential primary.

The website RealClearPolitics.com, which maintains a running average of recent polling data, indicates Obama is maintaining a lead of 1.3 percentage points over Romney among likely New Hampshire voters.